🔒 USN-4335-1: Thunderbird vulnerabilities | Unix & Linux Server

USN-4335-1: Thunderbird vulnerabilities

thunderbird vulnerabilities A security issue affects these releases of Ubuntu and its derivatives: Ubuntu 16.04 LTS Summary Several security issues were fixed in Thunderbird. Software Description thunderbird - Mozilla Open Source mail…

Unix & Linux Server usn.ubuntu.com 21.04.2020, 22:14 Uhr 3 Min. Lesezeit TA0001 · T1190 KEV ACTIVE EPSS 46.3% CWE-79

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thunderbird vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

Ubuntu 16.04 LTS

Summary

Several security issues were fixed in Thunderbird.

Software Description

thunderbird - Mozilla Open Source mail and newsgroup client

Details

Multiple security issues were discovered in Thunderbird. If a user were
tricked in to opening a specially crafted website in a browsing context,
an attacker could potentially exploit these to cause a denial of service,
obtain sensitive information, bypass security restrictions, bypass
same-origin restrictions, conduct cross-site scripting (XSS) attacks, or
execute arbitrary code. (CVE-2019-11757, CVE-2019-11758, CVE-2019-11759,
CVE-2019-11760, CVE-2019-11761, CVE-2019-11762, CVE-2019-11763,
CVE-2019-11764, CVE-2019-17005, CVE-2019-17008, CVE-2019-17010,
CVE-2019-17011, CVE-2019-17012, CVE-2019-17016, CVE-2019-17017,
CVE-2019-17022, CVE-2019-17024, CVE-2019-17026, CVE-2019-20503,
CVE-2020-6798, CVE-2020-6800, CVE-2020-6805, CVE-2020-6806, CVE-2020-6807,
CVE-2020-6812, CVE-2020-6814, CVE-2020-6819, CVE-2020-6820, CVE-2020-6821,
CVE-2020-6825)

It was discovered that NSS incorrectly handled certain memory operations.
A remote attacker could potentially exploit this to cause a denial of
service, or execute arbitrary code. (CVE-2019-11745)

It was discovered that a specially crafted S/MIME message with an inner
encryption layer could be displayed as having a valid signature in some
circumstances, even if the signer had no access to the encrypted message.
An attacker could potentially exploit this to spoof the message author.
(CVE-2019-11755)

A heap overflow was discovered in the expat library in Thunderbird. If a
user were tricked in to opening a specially crafted message, an attacker
could potentially exploit this to cause a denial of service, or execute
arbitrary code. (CVE-2019-15903)

It was discovered that Message ID calculation was based on uninitialized
data. An attacker could potentially exploit this to obtain sensitive
information. (CVE-2020-6792)

Mutiple security issues were discovered in Thunderbird. If a user were
tricked in to opening a specially crafted message, an attacker could
potentially exploit these to cause a denial of service, obtain sensitive
information, or execute arbitrary code. (CVE-2020-6793, CVE-2020-6795,
CVE-2020-6822)

It was discovered that if a user saved passwords before Thunderbird 60 and
then later set a master password, an unencrypted copy of these passwords
would still be accessible. A local user could exploit this to obtain
sensitive information. (CVE-2020-6794)

It was discovered that the Devtools’ ‘Copy as cURL’ feature did not
fully escape website-controlled data. If a user were tricked in to using
the ‘Copy as cURL’ feature to copy and paste a command with specially
crafted data in to a terminal, an attacker could potentially exploit this
to execute arbitrary commands via command injection. (CVE-2020-6811)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 16.04 LTS: thunderbird - 1:68.7.0+build1-0ubuntu0.16.04.2

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

After a standard system update you need to restart Thunderbird to make
all the necessary changes.

References

CVE-2019-11745

CVE-2019-11755

CVE-2019-11757

CVE-2019-11758

CVE-2019-11759

CVE-2019-11760

CVE-2019-11761

CVE-2019-11762

CVE-2019-11763

CVE-2019-11764

CVE-2019-15903

CVE-2019-17005

CVE-2019-17008

CVE-2019-17010

CVE-2019-17011

CVE-2019-17012

CVE-2019-17016

CVE-2019-17017

CVE-2019-17022

CVE-2019-17024

CVE-2019-17026

CVE-2019-20503

CVE-2020-6792

CVE-2020-6793

CVE-2020-6794

CVE-2020-6795

CVE-2020-6798

CVE-2020-6800

CVE-2020-6805

CVE-2020-6806

CVE-2020-6807

CVE-2020-6811

CVE-2020-6812

CVE-2020-6814

CVE-2020-6819

CVE-2020-6820

CVE-2020-6821

CVE-2020-6822

CVE-2020-6825

IoC Intelligence (39 Indikatoren)

CVE-2019-11757CVE-2019-11758CVE-2019-11759CVE-2019-11760CVE-2019-11761CVE-2019-11762CVE-2019-11763CVE-2019-11764+31 weitere

CTI Threat Relationship Graph4 Knoten / 3 Relationen

CVE / Incident Software MITRE ATT&CK CWE Weakness IoC

IR-PLAYBOOK-RCE

HIGH

SOC Incident Playbook: Remote Code Execution (RCE) Defense

WAF MitigationSofort

Virtuelles Patchen am Reverse Proxy / WAF für gefährdete URL-Pfade und Payloads aktivieren.

SecRule REQUEST_URI "@rx ..." "id:1001,phase:1,deny,status:403"

Web Shell ScanSofort

Web-Root auf neu angelegte Scripts, anomal modifizierte Dateien und Persistence scannen.

find /var/www -type f -name "*.php" -mmin -120

Outbound FilteringSofort

Ausgehenden Datenverkehr (Reverse Shells zu unbekannten IPs/Ports) blockieren.

ss -tunp | grep -E ":(4444|1337|8080|9001)"

Vendor Patching

Hersteller-Update in Staging validieren und schnellstmöglich in Produktion ausrollen.

apt update && apt --only-upgrade install <pkg>

1-Click Detection Engineering: Sigma & YARA Rules

SOC Ready

title: Detect Exploitation - USN-4335-1: Thunderbird vulnerabilities
id: 7745f619-1c8c-4502-94b4-de704b299304
status: experimental
description: Automatisch generierte SIEM-Erkennungsregel basierend auf CTI Intelligence
references:
  - https://tsecurity.de/
author: iShareStuff CTI Automated Detection Engine
date: 2026-09-23
logsource:
  category: network_connection
  product: any
detection:
  selection:
      CommandLine|contains:
        - 'exploit'
  condition: selection
falsepositives:
  - Legitime administrative Zugriffe oder Penetrationstests
level: high
tags:
  - attack.initial_access
  - attack.t1190

rule CTI_Threat_Indicator {
    meta:
        author = "iShareStuff CTI Automated Detection Engine"
        date = "2026-09-23"
        description = "YARA Signature for "
    strings:
        $str = "USN-4335-1: Thunderbird vulner" ascii wide
    condition:
        any of them
}

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USN-4335-1: Thunderbird vulnerabilities

thunderbird vulnerabilities

Summary

Software Description

Details

Update instructions

References

SOC Incident Playbook: Remote Code Execution (RCE) Defense

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USN-4335-1: Thunderbird vulnerabilities

thunderbird vulnerabilities

Summary

Software Description

Details

Update instructions

References

SOC Incident Playbook: Remote Code Execution (RCE) Defense

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